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boringssl/crypto/pkcs8/pkcs8_x509.c
David Benjamin 8803c0589d Properly advance the CBS when parsing BER structures. 
CBS_asn1_ber_to_der was a little cumbersome to use. While it, in theory,
allowed callers to consistently advance past the element, no caller
actually did so consistently. Instead they would advance if conversion
happened, and not if it was already DER. For the PKCS7_* functions, this
was even caller-exposed.

Change-Id: I658d265df899bace9ba6616cb465f19c9e6c3534
Reviewed-on: https://boringssl-review.googlesource.com/29304
Reviewed-by: Adam Langley <agl@google.com>
2018-06-26 07:23:10 +00:00

1277 lines
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/pkcs8.h>
#include <limits.h>
#include <openssl/asn1t.h>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/buf.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/digest.h>
#include <openssl/hmac.h>
#include <openssl/mem.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include "internal.h"
#include "../bytestring/internal.h"
#include "../internal.h"
// Minor tweak to operation: zero private key data
static int pkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
void *exarg) {
// Since the structure must still be valid use ASN1_OP_FREE_PRE
if (operation == ASN1_OP_FREE_PRE) {
PKCS8_PRIV_KEY_INFO *key = (PKCS8_PRIV_KEY_INFO *)*pval;
if (key->pkey && key->pkey->type == V_ASN1_OCTET_STRING &&
key->pkey->value.octet_string) {
OPENSSL_cleanse(key->pkey->value.octet_string->data,
key->pkey->value.octet_string->length);
}
}
return 1;
}
ASN1_SEQUENCE_cb(PKCS8_PRIV_KEY_INFO, pkey_cb) = {
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, version, ASN1_INTEGER),
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, pkeyalg, X509_ALGOR),
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, pkey, ASN1_ANY),
ASN1_IMP_SET_OF_OPT(PKCS8_PRIV_KEY_INFO, attributes, X509_ATTRIBUTE, 0)
} ASN1_SEQUENCE_END_cb(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO)
IMPLEMENT_ASN1_FUNCTIONS(PKCS8_PRIV_KEY_INFO)
EVP_PKEY *EVP_PKCS82PKEY(PKCS8_PRIV_KEY_INFO *p8) {
uint8_t *der = NULL;
int der_len = i2d_PKCS8_PRIV_KEY_INFO(p8, &der);
if (der_len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, der, (size_t)der_len);
EVP_PKEY *ret = EVP_parse_private_key(&cbs);
if (ret == NULL || CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
EVP_PKEY_free(ret);
OPENSSL_free(der);
return NULL;
}
OPENSSL_free(der);
return ret;
}
PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey) {
CBB cbb;
uint8_t *der = NULL;
size_t der_len;
if (!CBB_init(&cbb, 0) ||
!EVP_marshal_private_key(&cbb, pkey) ||
!CBB_finish(&cbb, &der, &der_len) ||
der_len > LONG_MAX) {
CBB_cleanup(&cbb);
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_ENCODE_ERROR);
goto err;
}
const uint8_t *p = der;
PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, (long)der_len);
if (p8 == NULL || p != der + der_len) {
PKCS8_PRIV_KEY_INFO_free(p8);
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
goto err;
}
OPENSSL_free(der);
return p8;
err:
OPENSSL_free(der);
return NULL;
}
PKCS8_PRIV_KEY_INFO *PKCS8_decrypt(X509_SIG *pkcs8, const char *pass,
int pass_len_in) {
size_t pass_len;
if (pass_len_in == -1 && pass != NULL) {
pass_len = strlen(pass);
} else {
pass_len = (size_t)pass_len_in;
}
PKCS8_PRIV_KEY_INFO *ret = NULL;
EVP_PKEY *pkey = NULL;
uint8_t *in = NULL;
// Convert the legacy ASN.1 object to a byte string.
int in_len = i2d_X509_SIG(pkcs8, &in);
if (in_len < 0) {
goto err;
}
CBS cbs;
CBS_init(&cbs, in, in_len);
pkey = PKCS8_parse_encrypted_private_key(&cbs, pass, pass_len);
if (pkey == NULL || CBS_len(&cbs) != 0) {
goto err;
}
ret = EVP_PKEY2PKCS8(pkey);
err:
OPENSSL_free(in);
EVP_PKEY_free(pkey);
return ret;
}
X509_SIG *PKCS8_encrypt(int pbe_nid, const EVP_CIPHER *cipher, const char *pass,
int pass_len_in, const uint8_t *salt, size_t salt_len,
int iterations, PKCS8_PRIV_KEY_INFO *p8inf) {
size_t pass_len;
if (pass_len_in == -1 && pass != NULL) {
pass_len = strlen(pass);
} else {
pass_len = (size_t)pass_len_in;
}
// Parse out the private key.
EVP_PKEY *pkey = EVP_PKCS82PKEY(p8inf);
if (pkey == NULL) {
return NULL;
}
X509_SIG *ret = NULL;
uint8_t *der = NULL;
size_t der_len;
CBB cbb;
if (!CBB_init(&cbb, 128) ||
!PKCS8_marshal_encrypted_private_key(&cbb, pbe_nid, cipher, pass,
pass_len, salt, salt_len, iterations,
pkey) ||
!CBB_finish(&cbb, &der, &der_len)) {
CBB_cleanup(&cbb);
goto err;
}
// Convert back to legacy ASN.1 objects.
const uint8_t *ptr = der;
ret = d2i_X509_SIG(NULL, &ptr, der_len);
if (ret == NULL || ptr != der + der_len) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_INTERNAL_ERROR);
X509_SIG_free(ret);
ret = NULL;
}
err:
OPENSSL_free(der);
EVP_PKEY_free(pkey);
return ret;
}
struct pkcs12_context {
EVP_PKEY **out_key;
STACK_OF(X509) *out_certs;
const char *password;
size_t password_len;
};
// PKCS12_handle_sequence parses a BER-encoded SEQUENCE of elements in a PKCS#12
// structure.
static int PKCS12_handle_sequence(
CBS *sequence, struct pkcs12_context *ctx,
int (*handle_element)(CBS *cbs, struct pkcs12_context *ctx)) {
uint8_t *storage = NULL;
CBS in;
int ret = 0;
// Although a BER->DER conversion is done at the beginning of |PKCS12_parse|,
// the ASN.1 data gets wrapped in OCTETSTRINGs and/or encrypted and the
// conversion cannot see through those wrappings. So each time we step
// through one we need to convert to DER again.
if (!CBS_asn1_ber_to_der(sequence, &in, &storage)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
CBS child;
if (!CBS_get_asn1(&in, &child, CBS_ASN1_SEQUENCE) ||
CBS_len(&in) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
while (CBS_len(&child) > 0) {
CBS element;
if (!CBS_get_asn1(&child, &element, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!handle_element(&element, ctx)) {
goto err;
}
}
ret = 1;
err:
OPENSSL_free(storage);
return ret;
}
// 1.2.840.113549.1.12.10.1.2
static const uint8_t kPKCS8ShroudedKeyBag[] = {
0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x0a, 0x01, 0x02};
// 1.2.840.113549.1.12.10.1.3
static const uint8_t kCertBag[] = {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x0c, 0x0a, 0x01, 0x03};
// 1.2.840.113549.1.9.20
static const uint8_t kFriendlyName[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x14};
// 1.2.840.113549.1.9.21
static const uint8_t kLocalKeyID[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x15};
// 1.2.840.113549.1.9.22.1
static const uint8_t kX509Certificate[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x16, 0x01};
// parse_bag_attributes parses the bagAttributes field of a SafeBag structure.
// It sets |*out_friendly_name| to a newly-allocated copy of the friendly name,
// encoded as a UTF-8 string, or NULL if there is none. It returns one on
// success and zero on error.
static int parse_bag_attributes(CBS *attrs, uint8_t **out_friendly_name,
size_t *out_friendly_name_len) {
*out_friendly_name = NULL;
*out_friendly_name_len = 0;
// See https://tools.ietf.org/html/rfc7292#section-4.2.
while (CBS_len(attrs) != 0) {
CBS attr, oid, values;
if (!CBS_get_asn1(attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&attr, &values, CBS_ASN1_SET) ||
CBS_len(&attr) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_mem_equal(&oid, kFriendlyName, sizeof(kFriendlyName))) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.1.
CBS value;
if (*out_friendly_name != NULL ||
!CBS_get_asn1(&values, &value, CBS_ASN1_BMPSTRING) ||
CBS_len(&values) != 0 ||
CBS_len(&value) == 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// Convert the friendly name to UTF-8.
CBB cbb;
if (!CBB_init(&cbb, CBS_len(&value))) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
goto err;
}
while (CBS_len(&value) != 0) {
uint32_t c;
if (!cbs_get_ucs2_be(&value, &c) ||
!cbb_add_utf8(&cbb, c)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INVALID_CHARACTERS);
CBB_cleanup(&cbb);
goto err;
}
}
if (!CBB_finish(&cbb, out_friendly_name, out_friendly_name_len)) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
CBB_cleanup(&cbb);
goto err;
}
}
}
return 1;
err:
OPENSSL_free(*out_friendly_name);
*out_friendly_name = NULL;
*out_friendly_name_len = 0;
return 0;
}
// PKCS12_handle_safe_bag parses a single SafeBag element in a PKCS#12
// structure.
static int PKCS12_handle_safe_bag(CBS *safe_bag, struct pkcs12_context *ctx) {
CBS bag_id, wrapped_value, bag_attrs;
if (!CBS_get_asn1(safe_bag, &bag_id, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(safe_bag, &wrapped_value,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
if (CBS_len(safe_bag) == 0) {
CBS_init(&bag_attrs, NULL, 0);
} else if (!CBS_get_asn1(safe_bag, &bag_attrs, CBS_ASN1_SET) ||
CBS_len(safe_bag) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
if (CBS_mem_equal(&bag_id, kPKCS8ShroudedKeyBag,
sizeof(kPKCS8ShroudedKeyBag))) {
// See RFC 7292, section 4.2.2.
if (*ctx->out_key) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_MULTIPLE_PRIVATE_KEYS_IN_PKCS12);
return 0;
}
EVP_PKEY *pkey = PKCS8_parse_encrypted_private_key(
&wrapped_value, ctx->password, ctx->password_len);
if (pkey == NULL) {
return 0;
}
if (CBS_len(&wrapped_value) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
EVP_PKEY_free(pkey);
return 0;
}
*ctx->out_key = pkey;
return 1;
}
if (CBS_mem_equal(&bag_id, kCertBag, sizeof(kCertBag))) {
// See RFC 7292, section 4.2.3.
CBS cert_bag, cert_type, wrapped_cert, cert;
if (!CBS_get_asn1(&wrapped_value, &cert_bag, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&cert_bag, &cert_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&cert_bag, &wrapped_cert,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
!CBS_get_asn1(&wrapped_cert, &cert, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
// Skip unknown certificate types.
if (!CBS_mem_equal(&cert_type, kX509Certificate,
sizeof(kX509Certificate))) {
return 1;
}
if (CBS_len(&cert) > LONG_MAX) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
const uint8_t *inp = CBS_data(&cert);
X509 *x509 = d2i_X509(NULL, &inp, (long)CBS_len(&cert));
if (!x509) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
if (inp != CBS_data(&cert) + CBS_len(&cert)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
X509_free(x509);
return 0;
}
uint8_t *friendly_name;
size_t friendly_name_len;
if (!parse_bag_attributes(&bag_attrs, &friendly_name, &friendly_name_len)) {
X509_free(x509);
return 0;
}
int ok = friendly_name_len == 0 ||
X509_alias_set1(x509, friendly_name, friendly_name_len);
OPENSSL_free(friendly_name);
if (!ok ||
0 == sk_X509_push(ctx->out_certs, x509)) {
X509_free(x509);
return 0;
}
return 1;
}
// Unknown element type - ignore it.
return 1;
}
// 1.2.840.113549.1.7.1
static const uint8_t kPKCS7Data[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x07, 0x01};
// 1.2.840.113549.1.7.6
static const uint8_t kPKCS7EncryptedData[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x07, 0x06};
// PKCS12_handle_content_info parses a single PKCS#7 ContentInfo element in a
// PKCS#12 structure.
static int PKCS12_handle_content_info(CBS *content_info,
struct pkcs12_context *ctx) {
CBS content_type, wrapped_contents, contents;
int ret = 0;
uint8_t *storage = NULL;
if (!CBS_get_asn1(content_info, &content_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(content_info, &wrapped_contents,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
CBS_len(content_info) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_mem_equal(&content_type, kPKCS7EncryptedData,
sizeof(kPKCS7EncryptedData))) {
// See https://tools.ietf.org/html/rfc2315#section-13.
//
// PKCS#7 encrypted data inside a PKCS#12 structure is generally an
// encrypted certificate bag and it's generally encrypted with 40-bit
// RC2-CBC.
CBS version_bytes, eci, contents_type, ai, encrypted_contents;
uint8_t *out;
size_t out_len;
if (!CBS_get_asn1(&wrapped_contents, &contents, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&contents, &version_bytes, CBS_ASN1_INTEGER) ||
// EncryptedContentInfo, see
// https://tools.ietf.org/html/rfc2315#section-10.1
!CBS_get_asn1(&contents, &eci, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&eci, &contents_type, CBS_ASN1_OBJECT) ||
// AlgorithmIdentifier, see
// https://tools.ietf.org/html/rfc5280#section-4.1.1.2
!CBS_get_asn1(&eci, &ai, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_implicit_string(
&eci, &encrypted_contents, &storage,
CBS_ASN1_CONTEXT_SPECIFIC | 0, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!CBS_mem_equal(&contents_type, kPKCS7Data, sizeof(kPKCS7Data))) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!pkcs8_pbe_decrypt(&out, &out_len, &ai, ctx->password,
ctx->password_len, CBS_data(&encrypted_contents),
CBS_len(&encrypted_contents))) {
goto err;
}
CBS safe_contents;
CBS_init(&safe_contents, out, out_len);
ret = PKCS12_handle_sequence(&safe_contents, ctx, PKCS12_handle_safe_bag);
OPENSSL_free(out);
} else if (CBS_mem_equal(&content_type, kPKCS7Data, sizeof(kPKCS7Data))) {
CBS octet_string_contents;
if (!CBS_get_asn1(&wrapped_contents, &octet_string_contents,
CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
ret = PKCS12_handle_sequence(&octet_string_contents, ctx,
PKCS12_handle_safe_bag);
} else {
// Unknown element type - ignore it.
ret = 1;
}
err:
OPENSSL_free(storage);
return ret;
}
static int pkcs12_check_mac(int *out_mac_ok, const char *password,
size_t password_len, const CBS *salt,
unsigned iterations, const EVP_MD *md,
const CBS *authsafes, const CBS *expected_mac) {
int ret = 0;
uint8_t hmac_key[EVP_MAX_MD_SIZE];
if (!pkcs12_key_gen(password, password_len, CBS_data(salt), CBS_len(salt),
PKCS12_MAC_ID, iterations, EVP_MD_size(md), hmac_key,
md)) {
goto err;
}
uint8_t hmac[EVP_MAX_MD_SIZE];
unsigned hmac_len;
if (NULL == HMAC(md, hmac_key, EVP_MD_size(md), CBS_data(authsafes),
CBS_len(authsafes), hmac, &hmac_len)) {
goto err;
}
*out_mac_ok = CBS_mem_equal(expected_mac, hmac, hmac_len);
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
*out_mac_ok = 1;
#endif
ret = 1;
err:
OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
return ret;
}
int PKCS12_get_key_and_certs(EVP_PKEY **out_key, STACK_OF(X509) *out_certs,
CBS *ber_in, const char *password) {
uint8_t *storage = NULL;
CBS in, pfx, mac_data, authsafe, content_type, wrapped_authsafes, authsafes;
uint64_t version;
int ret = 0;
struct pkcs12_context ctx;
const size_t original_out_certs_len = sk_X509_num(out_certs);
// The input may be in BER format.
if (!CBS_asn1_ber_to_der(ber_in, &in, &storage)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
*out_key = NULL;
OPENSSL_memset(&ctx, 0, sizeof(ctx));
// See ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1.pdf, section
// four.
if (!CBS_get_asn1(&in, &pfx, CBS_ASN1_SEQUENCE) ||
CBS_len(&in) != 0 ||
!CBS_get_asn1_uint64(&pfx, &version)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (version < 3) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_VERSION);
goto err;
}
if (!CBS_get_asn1(&pfx, &authsafe, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_len(&pfx) == 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_MISSING_MAC);
goto err;
}
if (!CBS_get_asn1(&pfx, &mac_data, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// authsafe is a PKCS#7 ContentInfo. See
// https://tools.ietf.org/html/rfc2315#section-7.
if (!CBS_get_asn1(&authsafe, &content_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&authsafe, &wrapped_authsafes,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// The content type can either be data or signedData. The latter indicates
// that it's signed by a public key, which isn't supported.
if (!CBS_mem_equal(&content_type, kPKCS7Data, sizeof(kPKCS7Data))) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_PKCS12_PUBLIC_KEY_INTEGRITY_NOT_SUPPORTED);
goto err;
}
if (!CBS_get_asn1(&wrapped_authsafes, &authsafes, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
ctx.out_key = out_key;
ctx.out_certs = out_certs;
ctx.password = password;
ctx.password_len = password != NULL ? strlen(password) : 0;
// Verify the MAC.
{
CBS mac, salt, expected_mac;
if (!CBS_get_asn1(&mac_data, &mac, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
const EVP_MD *md = EVP_parse_digest_algorithm(&mac);
if (md == NULL) {
goto err;
}
if (!CBS_get_asn1(&mac, &expected_mac, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&mac_data, &salt, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// The iteration count is optional and the default is one.
uint64_t iterations = 1;
if (CBS_len(&mac_data) > 0) {
if (!CBS_get_asn1_uint64(&mac_data, &iterations) ||
iterations > UINT_MAX) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
}
int mac_ok;
if (!pkcs12_check_mac(&mac_ok, ctx.password, ctx.password_len, &salt,
iterations, md, &authsafes, &expected_mac)) {
goto err;
}
if (!mac_ok && ctx.password_len == 0) {
// PKCS#12 encodes passwords as NUL-terminated UCS-2, so the empty
// password is encoded as {0, 0}. Some implementations use the empty byte
// array for "no password". OpenSSL considers a non-NULL password as {0,
// 0} and a NULL password as {}. It then, in high-level PKCS#12 parsing
// code, tries both options. We match this behavior.
ctx.password = ctx.password != NULL ? NULL : "";
if (!pkcs12_check_mac(&mac_ok, ctx.password, ctx.password_len, &salt,
iterations, md, &authsafes, &expected_mac)) {
goto err;
}
}
if (!mac_ok) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INCORRECT_PASSWORD);
goto err;
}
}
// authsafes contains a series of PKCS#7 ContentInfos.
if (!PKCS12_handle_sequence(&authsafes, &ctx, PKCS12_handle_content_info)) {
goto err;
}
ret = 1;
err:
OPENSSL_free(storage);
if (!ret) {
EVP_PKEY_free(*out_key);
*out_key = NULL;
while (sk_X509_num(out_certs) > original_out_certs_len) {
X509 *x509 = sk_X509_pop(out_certs);
X509_free(x509);
}
}
return ret;
}
void PKCS12_PBE_add(void) {}
struct pkcs12_st {
uint8_t *ber_bytes;
size_t ber_len;
};
PKCS12 *d2i_PKCS12(PKCS12 **out_p12, const uint8_t **ber_bytes,
size_t ber_len) {
PKCS12 *p12;
p12 = OPENSSL_malloc(sizeof(PKCS12));
if (!p12) {
return NULL;
}
p12->ber_bytes = OPENSSL_malloc(ber_len);
if (!p12->ber_bytes) {
OPENSSL_free(p12);
return NULL;
}
OPENSSL_memcpy(p12->ber_bytes, *ber_bytes, ber_len);
p12->ber_len = ber_len;
*ber_bytes += ber_len;
if (out_p12) {
PKCS12_free(*out_p12);
*out_p12 = p12;
}
return p12;
}
PKCS12* d2i_PKCS12_bio(BIO *bio, PKCS12 **out_p12) {
size_t used = 0;
BUF_MEM *buf;
const uint8_t *dummy;
static const size_t kMaxSize = 256 * 1024;
PKCS12 *ret = NULL;
buf = BUF_MEM_new();
if (buf == NULL) {
return NULL;
}
if (BUF_MEM_grow(buf, 8192) == 0) {
goto out;
}
for (;;) {
int n = BIO_read(bio, &buf->data[used], buf->length - used);
if (n < 0) {
if (used == 0) {
goto out;
}
// Workaround a bug in node.js. It uses a memory BIO for this in the wrong
// mode.
n = 0;
}
if (n == 0) {
break;
}
used += n;
if (used < buf->length) {
continue;
}
if (buf->length > kMaxSize ||
BUF_MEM_grow(buf, buf->length * 2) == 0) {
goto out;
}
}
dummy = (uint8_t*) buf->data;
ret = d2i_PKCS12(out_p12, &dummy, used);
out:
BUF_MEM_free(buf);
return ret;
}
PKCS12* d2i_PKCS12_fp(FILE *fp, PKCS12 **out_p12) {
BIO *bio;
PKCS12 *ret;
bio = BIO_new_fp(fp, 0 /* don't take ownership */);
if (!bio) {
return NULL;
}
ret = d2i_PKCS12_bio(bio, out_p12);
BIO_free(bio);
return ret;
}
int i2d_PKCS12(const PKCS12 *p12, uint8_t **out) {
if (p12->ber_len > INT_MAX) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_OVERFLOW);
return -1;
}
if (out == NULL) {
return (int)p12->ber_len;
}
if (*out == NULL) {
*out = OPENSSL_malloc(p12->ber_len);
if (*out == NULL) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
return -1;
}
OPENSSL_memcpy(*out, p12->ber_bytes, p12->ber_len);
} else {
OPENSSL_memcpy(*out, p12->ber_bytes, p12->ber_len);
*out += p12->ber_len;
}
return (int)p12->ber_len;
}
int i2d_PKCS12_bio(BIO *bio, const PKCS12 *p12) {
size_t written = 0;
while (written < p12->ber_len) {
size_t todo = p12->ber_len - written;
int len = todo > INT_MAX ? INT_MAX : (int)todo;
int ret = BIO_write(bio, p12->ber_bytes + written, len);
if (ret <= 0) {
return 0;
}
written += (size_t)ret;
}
return 1;
}
int i2d_PKCS12_fp(FILE *fp, const PKCS12 *p12) {
BIO *bio = BIO_new_fp(fp, 0 /* don't take ownership */);
if (bio == NULL) {
return 0;
}
int ret = i2d_PKCS12_bio(bio, p12);
BIO_free(bio);
return ret;
}
int PKCS12_parse(const PKCS12 *p12, const char *password, EVP_PKEY **out_pkey,
X509 **out_cert, STACK_OF(X509) **out_ca_certs) {
CBS ber_bytes;
STACK_OF(X509) *ca_certs = NULL;
char ca_certs_alloced = 0;
if (out_ca_certs != NULL && *out_ca_certs != NULL) {
ca_certs = *out_ca_certs;
}
if (!ca_certs) {
ca_certs = sk_X509_new_null();
if (ca_certs == NULL) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
return 0;
}
ca_certs_alloced = 1;
}
CBS_init(&ber_bytes, p12->ber_bytes, p12->ber_len);
if (!PKCS12_get_key_and_certs(out_pkey, ca_certs, &ber_bytes, password)) {
if (ca_certs_alloced) {
sk_X509_free(ca_certs);
}
return 0;
}
*out_cert = NULL;
if (sk_X509_num(ca_certs) > 0) {
*out_cert = sk_X509_shift(ca_certs);
}
if (out_ca_certs) {
*out_ca_certs = ca_certs;
} else {
sk_X509_pop_free(ca_certs, X509_free);
}
return 1;
}
int PKCS12_verify_mac(const PKCS12 *p12, const char *password,
int password_len) {
if (password == NULL) {
if (password_len != 0) {
return 0;
}
} else if (password_len != -1 &&
(password[password_len] != 0 ||
OPENSSL_memchr(password, 0, password_len) != NULL)) {
return 0;
}
EVP_PKEY *pkey = NULL;
X509 *cert = NULL;
if (!PKCS12_parse(p12, password, &pkey, &cert, NULL)) {
ERR_clear_error();
return 0;
}
EVP_PKEY_free(pkey);
X509_free(cert);
return 1;
}
// add_bag_attributes adds the bagAttributes field of a SafeBag structure,
// containing the specified friendlyName and localKeyId attributes.
static int add_bag_attributes(CBB *bag, const char *name, const uint8_t *key_id,
size_t key_id_len) {
if (name == NULL && key_id_len == 0) {
return 1; // Omit the OPTIONAL SET.
}
// See https://tools.ietf.org/html/rfc7292#section-4.2.
CBB attrs, attr, oid, values, value;
if (!CBB_add_asn1(bag, &attrs, CBS_ASN1_SET)) {
return 0;
}
if (name != NULL) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.1.
if (!CBB_add_asn1(&attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kFriendlyName, sizeof(kFriendlyName)) ||
!CBB_add_asn1(&attr, &values, CBS_ASN1_SET) ||
!CBB_add_asn1(&values, &value, CBS_ASN1_BMPSTRING)) {
return 0;
}
// Convert the friendly name to a BMPString.
CBS name_cbs;
CBS_init(&name_cbs, (const uint8_t *)name, strlen(name));
while (CBS_len(&name_cbs) != 0) {
uint32_t c;
if (!cbs_get_utf8(&name_cbs, &c) ||
!cbb_add_ucs2_be(&value, c)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INVALID_CHARACTERS);
return 0;
}
}
}
if (key_id_len != 0) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.2.
if (!CBB_add_asn1(&attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kLocalKeyID, sizeof(kLocalKeyID)) ||
!CBB_add_asn1(&attr, &values, CBS_ASN1_SET) ||
!CBB_add_asn1(&values, &value, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&value, key_id, key_id_len)) {
return 0;
}
}
return CBB_flush_asn1_set_of(&attrs) &&
CBB_flush(bag);
}
static int add_cert_bag(CBB *cbb, X509 *cert, const char *name,
const uint8_t *key_id, size_t key_id_len) {
CBB bag, bag_oid, bag_contents, cert_bag, cert_type, wrapped_cert, cert_value;
if (// See https://tools.ietf.org/html/rfc7292#section-4.2.
!CBB_add_asn1(cbb, &bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&bag, &bag_oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&bag_oid, kCertBag, sizeof(kCertBag)) ||
!CBB_add_asn1(&bag, &bag_contents,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
// See https://tools.ietf.org/html/rfc7292#section-4.2.3.
!CBB_add_asn1(&bag_contents, &cert_bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&cert_bag, &cert_type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&cert_type, kX509Certificate, sizeof(kX509Certificate)) ||
!CBB_add_asn1(&cert_bag, &wrapped_cert,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&wrapped_cert, &cert_value, CBS_ASN1_OCTETSTRING)) {
return 0;
}
uint8_t *buf;
int len = i2d_X509(cert, NULL);
if (len < 0 ||
!CBB_add_space(&cert_value, &buf, (size_t)len) ||
i2d_X509(cert, &buf) < 0 ||
!add_bag_attributes(&bag, name, key_id, key_id_len) ||
!CBB_flush(cbb)) {
return 0;
}
return 1;
}
static int make_cert_safe_contents(uint8_t **out_data, size_t *out_len,
X509 *cert, const STACK_OF(X509) *chain,
const char *name, const uint8_t *key_id,
size_t key_id_len) {
int ret = 0;
CBB cbb, safe_contents;
if (!CBB_init(&cbb, 0) ||
!CBB_add_asn1(&cbb, &safe_contents, CBS_ASN1_SEQUENCE) ||
(cert != NULL &&
!add_cert_bag(&safe_contents, cert, name, key_id, key_id_len))) {
goto err;
}
for (size_t i = 0; i < sk_X509_num(chain); i++) {
// Only the leaf certificate gets attributes.
if (!add_cert_bag(&safe_contents, sk_X509_value(chain, i), NULL, NULL, 0)) {
goto err;
}
}
ret = CBB_finish(&cbb, out_data, out_len);
err:
CBB_cleanup(&cbb);
return ret;
}
static int add_encrypted_data(CBB *out, int pbe_nid, const char *password,
size_t password_len, unsigned iterations,
const uint8_t *in, size_t in_len) {
uint8_t salt[PKCS5_SALT_LEN];
if (!RAND_bytes(salt, sizeof(salt))) {
return 0;
}
int ret = 0;
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
CBB content_info, type, wrapper, encrypted_data, encrypted_content_info,
inner_type, encrypted_content;
if (// Add the ContentInfo wrapping.
!CBB_add_asn1(out, &content_info, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&content_info, &type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&type, kPKCS7EncryptedData, sizeof(kPKCS7EncryptedData)) ||
!CBB_add_asn1(&content_info, &wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
// See https://tools.ietf.org/html/rfc2315#section-13.
!CBB_add_asn1(&wrapper, &encrypted_data, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&encrypted_data, 0 /* version */) ||
// See https://tools.ietf.org/html/rfc2315#section-10.1.
!CBB_add_asn1(&encrypted_data, &encrypted_content_info,
CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&encrypted_content_info, &inner_type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&inner_type, kPKCS7Data, sizeof(kPKCS7Data)) ||
// Set up encryption and fill in contentEncryptionAlgorithm.
!pkcs12_pbe_encrypt_init(&encrypted_content_info, &ctx, pbe_nid,
iterations, password, password_len, salt,
sizeof(salt)) ||
// Note this tag is primitive. It is an implicitly-tagged OCTET_STRING, so
// it inherits the inner tag's constructed bit.
!CBB_add_asn1(&encrypted_content_info, &encrypted_content,
CBS_ASN1_CONTEXT_SPECIFIC | 0)) {
goto err;
}
size_t max_out = in_len + EVP_CIPHER_CTX_block_size(&ctx);
if (max_out < in_len) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_TOO_LONG);
goto err;
}
uint8_t *ptr;
int n1, n2;
if (!CBB_reserve(&encrypted_content, &ptr, max_out) ||
!EVP_CipherUpdate(&ctx, ptr, &n1, in, in_len) ||
!EVP_CipherFinal_ex(&ctx, ptr + n1, &n2) ||
!CBB_did_write(&encrypted_content, n1 + n2) ||
!CBB_flush(out)) {
goto err;
}
ret = 1;
err:
EVP_CIPHER_CTX_cleanup(&ctx);
return ret;
}
PKCS12 *PKCS12_create(const char *password, const char *name,
const EVP_PKEY *pkey, X509 *cert,
const STACK_OF(X509)* chain, int key_nid, int cert_nid,
int iterations, int mac_iterations, int key_type) {
if (key_nid == 0) {
key_nid = NID_pbe_WithSHA1And3_Key_TripleDES_CBC;
}
if (cert_nid == 0) {
cert_nid = NID_pbe_WithSHA1And40BitRC2_CBC;
}
if (iterations == 0) {
iterations = PKCS5_DEFAULT_ITERATIONS;
}
if (mac_iterations == 0) {
mac_iterations = 1;
}
if (// In OpenSSL, this specifies a non-standard Microsoft key usage extension
// which we do not currently support.
key_type != 0 ||
// In OpenSSL, -1 here means to use no encryption, which we do not
// currently support.
key_nid < 0 || cert_nid < 0 ||
// In OpenSSL, -1 here means to omit the MAC, which we do not
// currently support. Omitting it is also invalid for a password-based
// PKCS#12 file.
mac_iterations < 0 ||
// Don't encode empty objects.
(pkey == NULL && cert == NULL && sk_X509_num(chain) == 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_OPTIONS);
return 0;
}
// Note that |password| may be NULL to specify no password, rather than the
// empty string. They are encoded differently in PKCS#12. (One is the empty
// byte array and the other is NUL-terminated UCS-2.)
size_t password_len = password != NULL ? strlen(password) : 0;
uint8_t key_id[EVP_MAX_MD_SIZE];
unsigned key_id_len = 0;
if (cert != NULL && pkey != NULL) {
if (!X509_check_private_key(cert, pkey) ||
// Matching OpenSSL, use the SHA-1 hash of the certificate as the local
// key ID. Some PKCS#12 consumers require one to connect the private key
// and certificate.
!X509_digest(cert, EVP_sha1(), key_id, &key_id_len)) {
return 0;
}
}
// See https://tools.ietf.org/html/rfc7292#section-4.
PKCS12 *ret = NULL;
CBB cbb, pfx, auth_safe, auth_safe_oid, auth_safe_wrapper, auth_safe_data,
content_infos;
uint8_t mac_key[EVP_MAX_MD_SIZE];
if (!CBB_init(&cbb, 0) ||
!CBB_add_asn1(&cbb, &pfx, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&pfx, 3) ||
// auth_safe is a data ContentInfo.
!CBB_add_asn1(&pfx, &auth_safe, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&auth_safe, &auth_safe_oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&auth_safe_oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
!CBB_add_asn1(&auth_safe, &auth_safe_wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&auth_safe_wrapper, &auth_safe_data,
CBS_ASN1_OCTETSTRING) ||
// See https://tools.ietf.org/html/rfc7292#section-4.1. |auth_safe|'s
// contains a SEQUENCE of ContentInfos.
!CBB_add_asn1(&auth_safe_data, &content_infos, CBS_ASN1_SEQUENCE)) {
goto err;
}
// If there are any certificates, place them in CertBags wrapped in a single
// encrypted ContentInfo.
if (cert != NULL || sk_X509_num(chain) > 0) {
uint8_t *data;
size_t len;
if (!make_cert_safe_contents(&data, &len, cert, chain, name, key_id,
key_id_len)) {
goto err;
}
int ok = add_encrypted_data(&content_infos, cert_nid, password,
password_len, iterations, data, len);
OPENSSL_free(data);
if (!ok) {
goto err;
}
}
// If there is a key, place it in a single PKCS8ShroudedKeyBag wrapped in an
// unencrypted ContentInfo. (One could also place it in a KeyBag inside an
// encrypted ContentInfo, but OpenSSL does not do this and some PKCS#12
// consumers do not support KeyBags.)
if (pkey != NULL) {
CBB content_info, oid, wrapper, data, safe_contents, bag, bag_oid,
bag_contents;
if (// Add another data ContentInfo.
!CBB_add_asn1(&content_infos, &content_info, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&content_info, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
!CBB_add_asn1(&content_info, &wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&wrapper, &data, CBS_ASN1_OCTETSTRING) ||
!CBB_add_asn1(&data, &safe_contents, CBS_ASN1_SEQUENCE) ||
// Add a SafeBag containing a PKCS8ShroudedKeyBag.
!CBB_add_asn1(&safe_contents, &bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&bag, &bag_oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&bag_oid, kPKCS8ShroudedKeyBag,
sizeof(kPKCS8ShroudedKeyBag)) ||
!CBB_add_asn1(&bag, &bag_contents,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!PKCS8_marshal_encrypted_private_key(
&bag_contents, key_nid, NULL, password, password_len,
NULL /* generate a random salt */, 0 /* use default salt length */,
iterations, pkey) ||
!add_bag_attributes(&bag, name, key_id, key_id_len) ||
!CBB_flush(&content_infos)) {
goto err;
}
}
// Compute the MAC. Match OpenSSL in using SHA-1 as the hash function. The MAC
// covers |auth_safe_data|.
const EVP_MD *mac_md = EVP_sha1();
uint8_t mac_salt[PKCS5_SALT_LEN];
uint8_t mac[EVP_MAX_MD_SIZE];
unsigned mac_len;
if (!CBB_flush(&auth_safe_data) ||
!RAND_bytes(mac_salt, sizeof(mac_salt)) ||
!pkcs12_key_gen(password, password_len, mac_salt, sizeof(mac_salt),
PKCS12_MAC_ID, mac_iterations, EVP_MD_size(mac_md),
mac_key, mac_md) ||
!HMAC(mac_md, mac_key, EVP_MD_size(mac_md), CBB_data(&auth_safe_data),
CBB_len(&auth_safe_data), mac, &mac_len)) {
goto err;
}
CBB mac_data, digest_info, mac_cbb, mac_salt_cbb;
if (!CBB_add_asn1(&pfx, &mac_data, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&mac_data, &digest_info, CBS_ASN1_SEQUENCE) ||
!EVP_marshal_digest_algorithm(&digest_info, mac_md) ||
!CBB_add_asn1(&digest_info, &mac_cbb, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&mac_cbb, mac, mac_len) ||
!CBB_add_asn1(&mac_data, &mac_salt_cbb, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&mac_salt_cbb, mac_salt, sizeof(mac_salt)) ||
// The iteration count has a DEFAULT of 1, but RFC 7292 says "The default
// is for historical reasons and its use is deprecated." Thus we
// explicitly encode the iteration count, though it is not valid DER.
!CBB_add_asn1_uint64(&mac_data, mac_iterations)) {
goto err;
}
ret = OPENSSL_malloc(sizeof(PKCS12));
if (ret == NULL ||
!CBB_finish(&cbb, &ret->ber_bytes, &ret->ber_len)) {
OPENSSL_free(ret);
ret = NULL;
goto err;
}
err:
OPENSSL_cleanse(mac_key, sizeof(mac_key));
CBB_cleanup(&cbb);
return ret;
}
void PKCS12_free(PKCS12 *p12) {
if (p12 == NULL) {
return;
}
OPENSSL_free(p12->ber_bytes);
OPENSSL_free(p12);
}
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